SQL Server 2008R2 memory issues

Hi Experts.
I have SQL Server 2008R2 installation,We allocated 102400MB(100GB) Memory   out of 128GB Installed.
But Task manager is showing  SQL Servr using 104 GB.Please some body let us know why SQL Server uisng more memory more than we allocated.
Please advise next step or recommendations if any 
OS :Windows 2008R2 64bit.
DB:SQL Server 2008R2 64bit.
Thanks in advance.
Regards,

But Task manager is showing  SQL Servr using 104 GB.Please some body let us know why SQL Server uisng more memory more than we allocated.
You should not refer to task manager for SQL server memory consumption. Its windows tool it always wont show you correct value.
Please use below query to SQL Server memory utilization
select
(physical_memory_in_use_kb/1024)Memory_usedby_Sqlserver_MB,
(locked_page_allocations_kb/1024 )Locked_pages_used_Sqlserver_MB,
(total_virtual_address_space_kb/1024 )Total_VAS_in_MB
from sys. dm_os_process_memory
100 G limit is put on SQL Server buffer pool. SQL Server can still use memory more than 100 G because few memory allocations for objects like, XML,SQLCLR, Linked server, backup , database mail etc are allocated directly by windows and sys.dm_os_process_memory
does not tracks it. So just relax this is normal
Task manager only show Working set.
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